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Tumtum Mountain is located in Amboy, WA in Clark County Washington and is the youngest volcano in the Cascades of Washington State. It was formed when lava rose to the surface along the Chelatchie Fault which passes along the southern edge of Chelatchie Prarie. The rock of Tumtum mountain is a light gray dacite with silica content which is similar to those found in the lava domes of Mount St. Helens.
In Washington State there are three main types of volcanoes. Cinder cones, composite colvanoes (stratovolcanoes) and shield volcanoes. Cinder cones, are the simplest type of volcanot and are steep cone-shaped hills made up of colled, air-filled lava, called cinder or scoria that were ejected from a single vent. Composite volvanoes or stratovolcanoes are what all the major cascade volcanoes are. They are very tall, built from alternating layers of volcanic ash, lava flows and cinder. It is formed from conduits where magma travels from deep within the Earth to the surface through a central vent. Sheild volcanoes are the largest volcanoes in the world. They are called shield volvanoes because when you look at them from afar they resemble a warrior's shield. They have shallow slopes and are made of layer upon layer of colled lava that flowed down the slope in all directions from a ceneral vent or group of vents.
Go to the given coordinates which is on a public road and view the mountain from there.
- What type of volcano is Tumtum Mountain?
- What is the estimated elevation of Tumtum Mountain?
- Do you see any of the gray dacite visible from this location?
Feel free to post a picture of yourself with the mountain in the background!
Information for this earthcache was gathered from the following sources: